JPH0213012B2 - - Google Patents
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- Publication number
- JPH0213012B2 JPH0213012B2 JP15130585A JP15130585A JPH0213012B2 JP H0213012 B2 JPH0213012 B2 JP H0213012B2 JP 15130585 A JP15130585 A JP 15130585A JP 15130585 A JP15130585 A JP 15130585A JP H0213012 B2 JPH0213012 B2 JP H0213012B2
- Authority
- JP
- Japan
- Prior art keywords
- rail
- cooling
- heat treatment
- rails
- head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Heat Treatment Of Articles (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本装置は熱延直後の、所定の長さに切断された
オーステナイト領域の温度を有しているレールの
頭部に、空気等の冷媒を噴射することにより、レ
ール頭部を急冷させ、耐摩耗性の微細パーライト
組織を形成させると共に、全体をバランスよく冷
却して曲がりの少ないレールを製造するための熱
処理装置に関するものである。Detailed Description of the Invention (Field of Industrial Application) This device supplies a coolant such as air to the head of a rail that has been cut into a predetermined length and has the temperature of an austenite region immediately after hot rolling. The present invention relates to a heat treatment apparatus for rapidly cooling the rail head to form a wear-resistant fine pearlite structure and cooling the entire rail in a well-balanced manner to produce a rail with less bending.
（従来の技術）
従来、前記のようなレールの冷却装置として、
特開昭59−74227号公報に記載された装置がある。(Prior Art) Conventionally, as the above-mentioned rail cooling device,
There is an apparatus described in Japanese Patent Application Laid-Open No. 59-74227.
この従来装置は第３図、及び第４図に示す様に
多数のロール９を有するローラー型拘束装置を備
え、多数の低圧水噴霧ヘツダー１ａ，１ｂとそれ
と交互に設けられた、多数の空気地帯２ａ，２ｂ
とをもつ冷却装置に、正立状態のレールを通すこ
とにより、水噴霧と空気地帯により断続的に強制
冷却させ、所定温度に達した際、媒体供給を停止
させて、耐摩耗性を有するレールを製造するもの
である。 As shown in FIGS. 3 and 4, this conventional device is equipped with a roller-type restraint device having a large number of rolls 9, and has a large number of low-pressure water spray headers 1a, 1b and a large number of air zones provided alternately therewith. 2a, 2b
By passing the upright rail through a cooling device, the rail is forced to cool intermittently using water spray and air zones, and when a predetermined temperature is reached, the medium supply is stopped, creating a wear-resistant rail. It manufactures.
この様なレールの伸延方向通過型の冷却装置で
は通過レールの最先端に対し、最尾端は冷却開始
時機が遅れ、冷却開始温度が低下することとな
る。 In such a rail passing type cooling device, the time to start cooling is delayed at the trailing end of the passing rail compared to the leading end, resulting in a lower cooling start temperature.
熱間圧延されたレールを再加熱することなく直
接冷却することにより、耐摩耗性の微細パーライ
ト組織を得ようとする工程において、冷却装置に
より熱間圧延成形後、熱間鋸断、熱間打刻後に熱
処理するのが適正な製造工程である。同工程での
レール温度調査を行つた結果、比較的軽量の40〜
50Kg/mレールに於いては、オーステナイト領域
の限界近傍の温度であり、冷却開始までの時間的
余裕は少ない事が判明した。 In the process of obtaining a wear-resistant fine pearlite structure by directly cooling the hot-rolled rail without reheating it, the cooling device performs hot-rolling, hot-saw cutting, and hot-beating. A proper manufacturing process is to heat treat the material after cutting. As a result of conducting a rail temperature survey during the same process, we found that relatively lightweight 40~
For the 50Kg/m rail, the temperature was close to the limit of the austenite region, and it was found that there was little time available for cooling to begin.
この様な条件下で通過式の冷却装置を採用する
ためには冷却装置入側に保熱対策を構じるか、又
は通過速度を速くする必要がある。前者は保熱装
置を必要とし、設備的には高価なものとなる。後
者の場合は冷却時間を一定とするなら、通過速度
に比例して冷却帯は長くなり、現実的でないた
め、高速で冷却帯に取込み、以降所定の速度で冷
却を行う事となる。 In order to employ a pass-through type cooling device under such conditions, it is necessary to provide heat retention measures on the inlet side of the cooling device or to increase the passing speed. The former requires a heat retaining device and is expensive in terms of equipment. In the latter case, if the cooling time is constant, the cooling zone will become longer in proportion to the passing speed, which is impractical, so the material must be taken into the cooling zone at a high speed and then cooled at a predetermined rate.
（発明が解決しようとする問題点）
第５図は従来の通過式の冷却装置を用いて、高
速取込後、冷却開始する場合のレールの移動距離
と冷却時間の関係を示すもので、この図から明ら
かな様に冷却帯必要長さＬは次式で示される。(Problems to be Solved by the Invention) Figure 5 shows the relationship between rail movement distance and cooling time when cooling is started after high-speed intake using a conventional pass-through cooling system. As is clear from the figure, the required length L of the cooling zone is expressed by the following formula.
Ｌ＝L1＋L2＝L1＋（ｖ×Ｔ）
L1：熱処理レール長さ
L2：冷却中のレール移動距離
ｖ：冷却中のレール移動速度
Ｔ：冷却時間
前述の冷却帯は冷却処理を行つている間、常に
L2相当分の無効冷却帯が存在しており、この無
効冷却帯で消費する冷媒コストは無視出来ないも
のとなる。この無効冷媒を無くすには冷却帯を小
ゾーンに分割し、レールの移動に伴つて進入、尻
抜け部分に於いて連続的に噴射ノズルの開、閉が
行わねばならず、制御数単位の増大と機能を複雑
化し、装置の長大化と共に設備的には高価なもの
となる。 L = L 1 + L 2 = L 1 + (v x T) L 1 : Length of heat treated rail L 2 : Rail movement distance during cooling v: Rail movement speed during cooling T: Cooling time The cooling zone mentioned above is cooling treatment always while doing
There is an ineffective cooling zone equivalent to L 2 , and the refrigerant cost consumed in this inactive cooling zone cannot be ignored. In order to eliminate this ineffective refrigerant, the cooling zone must be divided into small zones, and the injection nozzle must be opened and closed continuously at the entry and tail sections as the rail moves, increasing the number of control units. This complicates the functions, increases the length of the device, and makes the equipment expensive.
一般にレールは１鋼片から圧延される長さは
100〜150ｍにも達し、１ラインで同レールの熱処
理を行おうとすると長大なラインが必要となり、
敷地制約、熱処理開始温度確保の点から複数ライ
ンとならざるを得なく、ライン数が多い程、前述
の無効冷却帯の比率は大きくなる。 Generally, the length of rail rolled from one piece of steel is
It can reach 100 to 150 meters, and if you try to heat treat the same rail on one line, you will need a long line.
Due to site constraints and securing the heat treatment start temperature, multiple lines have to be used, and the larger the number of lines, the larger the ratio of the above-mentioned ineffective cooling zone becomes.
従つて、従来の通過式のレール冷却装置は無効
冷却帯を有するため、エネルギーコストの増大、
設備建設費の増大等の問題があつた。故に冷却帯
長さが短く、装置設置スペースの小さな省エネル
ギー型の熱延レールの熱処理装置の出現が切望さ
れた。 Therefore, the conventional pass-through rail cooling system has an ineffective cooling zone, which increases energy costs and
There were problems such as increased equipment construction costs. Therefore, there has been a strong desire for an energy-saving heat treatment apparatus for hot-rolled rails with a short cooling zone length and a small installation space.
（問題点を解決するための手段・作用）
前記目的を達成するために、本発明による熱延
レールの熱処理装置は、レールの伸延方向と直角
方向にレールを熱処理装置へ供給かつ搬出する積
載式搬送装置と、該搬送装置の上部にこの搬送装
置と独立して設置された架台、及び該架台に取付
けられた昇降枠、該昇降枠に取付けたレール頭頂
部冷却用気体噴射ノズル、及び該昇降枠に昇降可
能に取付けられた、レール頭側部冷却用気体噴射
ノズルから構成されるレール頭部冷却装置と、前
記搬送装置下部に固定配置されたレール脚裏部冷
却用気体噴射ノズル、及び搬送装置下部に設置し
た昇降自在のレール用位置決め・拘束装置を有す
ることを特徴としている。(Means/effects for solving the problems) In order to achieve the above object, the heat treatment apparatus for hot rolled rails according to the present invention is a loading type that supplies and carries out the rails to and from the heat treatment apparatus in a direction perpendicular to the rail extension direction. A transport device, a pedestal installed above the transport device independently of the transport device, an elevating frame attached to the pedestal, a gas injection nozzle for cooling the top of the rail attached to the elevating frame, and the elevating frame. A rail head cooling device consisting of a gas injection nozzle for cooling the side of the rail head, which is attached to the frame so as to be able to rise and fall; a gas injection nozzle for cooling the back of the rail legs fixedly arranged at the bottom of the transport device; It is characterized by having a rail positioning and restraint device installed at the bottom of the device that can be raised and lowered.
（実施例）
以下、本発明の実施例を図面を参照して説明す
る。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図は本発明の複数列配置の一実施態様を示
す。第１図に示すように、先ず素材レール１１ａ
はチエントランスフア１２の供給側に正立の状態
で熱処理間隔と同一の一定間隔l1に、図中に示し
ていない、他のトランスフア又は適当な搬送装置
により準備される。素材レール１１ａは熱処理位
置にチエントランスフア１２によつて４本同時に
搬送される。レール１１ｂは熱処理位置に搬送さ
れた素材レールを示す。 FIG. 1 shows an embodiment of the multi-row arrangement of the present invention. As shown in FIG. 1, first, the material rail 11a
are prepared in an upright position on the supply side of the chain transfer shaft 12 at constant intervals l 1 identical to the heat treatment intervals by another transfer or suitable conveying device, not shown in the figure. Four material rails 11a are simultaneously conveyed to the heat treatment position by the chain transfer shaft 12. Rail 11b shows the material rail conveyed to the heat treatment position.
搬送に先だち、搬送面に突起するセンターリン
グ及びクランプ装置の爪２１は開放し、チエント
ランスフア１２の搬送面以下に退避した状態にす
る。又、上部の冷却ノズル１８，１９はチエント
ランスフア１２と独立した架台１３に設置した昇
降装置１５、昇降枠１４によつて上方に退避した
状態にしておく。チエントランスフア１２によつ
て素材レール１１ａは、おおむね熱処理位置１１
ｂに搬送されると、各列毎に1.5ｍ〜４ｍ毎に配
置したセンターリング装置２２の爪２１を閉鎖さ
せ、冷却ノズル１８，２０の中心線上にレール１
１ｂの中心を正確に合わせる。更に爪２１をクラ
ンプ装置２３によつて下降させる事により、レー
ル１１ｂの脚部を爪２１の先端でチエントランス
フア１２上に固定する。 Prior to conveyance, the center ring and the claws 21 of the clamp device protruding from the conveyance surface are opened and retracted below the conveyance surface of the chain transfer shaft 12. Further, the upper cooling nozzles 18 and 19 are kept in a state of being retracted upward by an elevating device 15 and an elevating frame 14 installed on a frame 13 independent of the chain transfer shaft 12. The material rail 11a is moved to the heat treatment position 11 by the chain transfer shaft 12.
When the cooling nozzles 18 and 20 are conveyed to
Accurately align the center of 1b. Further, by lowering the claw 21 using the clamp device 23, the leg portion of the rail 11b is fixed onto the chain transfer shaft 12 at the tip of the claw 21.
レール頭部冷却装置は架台１３、昇降枠１４に
取付けられたレール頭部冷却用気体噴射ノズル、
昇降枠１４に昇降可能に取付けられた昇降枠１６
に設置されたレール頭側部冷却用気体噴射ノズル
から構成される。即ち、レール頭頂部冷却ノズル
１８は昇降枠１４に、レール頭側部冷却ノズル１
９は昇降枠１６に取付けられ、昇降装置１５によ
り、レール１１ｂに対し、所定の間隙の高さに設
定したのち、各列毎に設置した空気配管のバルブ
を開放して、レール１１ｂの頭部即ち第２図に示
すように頭頂部６ａ，ゲージコーナー６ｂ、頭側
部６ｃ、あご部分６ｄおよびあご下部分６ｅに亘
つて急冷させる。 The rail head cooling device includes a pedestal 13, a rail head cooling gas injection nozzle attached to the lifting frame 14,
A lifting frame 16 attached to the lifting frame 14 so as to be able to rise and fall
It consists of a gas injection nozzle installed on the side of the rail head for cooling. That is, the rail head cooling nozzle 18 is connected to the elevator frame 14, and the rail head side cooling nozzle 1 is connected to the elevator frame 14.
9 is attached to the lifting frame 16, and after setting the height to a predetermined gap with respect to the rail 11b using the lifting device 15, the valve of the air piping installed in each row is opened, and the head of the rail 11b is set. That is, as shown in FIG. 2, the top of the head 6a, the gauge corner 6b, the side of the head 6c, the chin 6d, and the lower chin 6e are rapidly cooled.
熱処理に必要な所定の冷却速度の設定は、レー
ル頭頂部に於いてはレール頭頂部冷却ノズル１８
とレール頭頂面間の距離、及び風量調整バルブ２
４の調整により、又レール頭側部冷却ノズル１９
は風量調整バルブ２５の調整により、広範囲に行
うことが出来る。又、レール頭側部冷却ノズル１
９はレール頭頂部冷却ノズル１８とレール１１ｂ
頭頂面間の距離設定に対応して、レール１１ｂの
頭側部に正しく対面すべく、昇降枠１６、昇降装
置１７によつて高さ設定が行われる。 The predetermined cooling rate required for heat treatment is set using the rail top cooling nozzle 18 at the top of the rail.
and the distance between the top of the rail and the air volume adjustment valve 2
By adjusting step 4, the rail head side cooling nozzle 19
can be performed over a wide range by adjusting the air volume adjustment valve 25. Also, rail head side cooling nozzle 1
9 is the rail top cooling nozzle 18 and the rail 11b
Corresponding to the setting of the distance between the tops of the head, the height is set by the lifting frame 16 and the lifting device 17 in order to properly face the head side portion of the rail 11b.
レール脚裏部冷却ノズル２０は、レール１１ｂ
の頭部冷却と同時に各系列毎に設置した空気配管
のバルブを開放してレール１１ｂの脚部の冷却を
行う。レール脚部の冷却速度は、風量調整バルブ
２６により、レール頭部冷却とバランスするよう
に調整され、熱処理後のレールの曲りを小さくす
ることが出来る。 The rail leg back cooling nozzle 20 is installed on the rail 11b.
At the same time as the head of the rail 11b is cooled, the legs of the rail 11b are cooled by opening the valves of the air piping installed in each series. The cooling rate of the rail legs is adjusted by the air volume adjustment valve 26 so as to be balanced with the cooling of the rail head, thereby making it possible to reduce the bending of the rail after heat treatment.
レールの冷却時間はレール１１ｂの上方に設置
した、図示していない温度検出器によつてレール
１１ｂの頭部温度を測温し、各レール毎の冷却所
要温度、時間が冷却時間制御システムにより算出
され、各々の冷却所要時間分の冷却が行われた後
空気供給を停止して冷却を完了する。 The rail cooling time is determined by measuring the head temperature of the rail 11b with a temperature detector (not shown) installed above the rail 11b, and calculating the required cooling temperature and time for each rail by a cooling time control system. After each cooling period is completed, the air supply is stopped and the cooling is completed.
全レールの冷却完了後、冷却ノズル１８，１９
は上昇退避し、クランプ装置２３の爪２１は開放
され、チエントランスフア１２の搬送面下に退避
する。熱処理を完了したレール１１ｂはチエント
ランスフア１２によつて４本同時に搬出され、既
に、搬出されたレール１１ｃは図中に示していな
い、他のトランスフアによつて次工程へ搬送され
る。 After cooling all the rails, the cooling nozzles 18 and 19
is raised and retracted, the claws 21 of the clamp device 23 are released, and the chain transfer shaft 12 is retracted below the conveyance surface. Four rails 11b that have undergone heat treatment are simultaneously carried out by the chain transfer shaft 12, and the rails 11c that have already been carried out are carried to the next process by another transfer shaft (not shown in the figure).
第１図の実施態様はレールを４本同時に熱処理
する装置であるが、１鋼片から圧延されるレール
本数の内、何本を熱処理するかによつて、熱処理
列数は自由に選定することが可能であり、いづれ
の場合でも単数又は複数本のレールを同様の方法
にて同時に処理することが出来、長さが許されれ
ば、短尺レールを同一列内に複数本収納して処理
することも可能である。また本装置は単数列にし
ても複数列にしてもよい。 The embodiment shown in Fig. 1 is an apparatus that heat-treats four rails at the same time, but the number of heat treatment rows can be freely selected depending on how many rails to be heat-treated out of the number of rails rolled from one steel billet. In either case, one or more rails can be processed simultaneously in the same way, and if the length allows, multiple short rails can be stored and processed in the same row. is also possible. Also, the device may be configured in a single row or in multiple rows.
（発明の効果）
以上説明したように本発明によるレールの熱処
理装置は、熱処理レール長さ分の冷却帯複数並列
に配置し、素材の供給、排出も１台のチエントラ
ンスフアで行えるものであり、又各レール毎に熱
処理条件を設定することが可能なため次の様な効
果が得られる。(Effects of the Invention) As explained above, the rail heat treatment apparatus according to the present invention has a plurality of cooling zones arranged in parallel corresponding to the length of the heat treatment rail, and material supply and discharge can be performed using a single chain transfer. Also, since it is possible to set heat treatment conditions for each rail, the following effects can be obtained.
(1) 設備がコンパクトとなるため、設備建設費及
び設置スペースが少なくてすむ。(1) Since the equipment is compact, construction costs and installation space are reduced.
(2) 無効冷却帯がないため、冷却コストが小さ
い。(2) Cooling costs are low because there is no ineffective cooling zone.
(3) 各列毎に冷却時間が制御出来るため、レール
の圧延に於ける長手方向の温度差等が生じて
も、安定した熱処理が可能である。(3) Since the cooling time can be controlled for each row, stable heat treatment is possible even if there is a temperature difference in the longitudinal direction during rail rolling.
(4) 風量調整及びノズル距離調整による広範囲な
冷却速度の設定が可能なため、寸法、鋼種の異
なつたレールに対して、中間強度から高強度ま
で幅広い熱処理レールの製造が出来る。(4) Since it is possible to set a wide range of cooling rates by adjusting the air volume and nozzle distance, it is possible to manufacture a wide range of heat-treated rails from intermediate strength to high strength for rails of different sizes and steel types.
(5) レール脚裏部からのバランス冷却により、レ
ールの冷却曲りを小さくすることが出来るた
め、次工程への搬送、曲り矯正負荷が軽減され
る。(5) Balanced cooling from the back of the rail legs can reduce cooling bends in the rails, reducing the load on transport to the next process and straightening the bends.
第１図はこの発明の実施態様を示す熱処理装置
の正面図、第２図はレール頭部の詳細図、第３図
は従来装置の実施例に係る冷却装置の側面図、第
４図は第３図に示す冷却装置の一部を拡大して示
す断面図、第５図は従来の通過式の冷却装置を用
いて、高速取込後、冷却開始する場合のレールの
移動距離と冷却時間の関係図である。
１ａ，１ｂ…噴霧ヘツダー、２ａ，２ｂ…空気
地帯、３ａ，３ｂ…隔壁、４…レールウエブ、５
…基部先端縁、６…頭部、７…基部、９…ローラ
ー、１０ａ，１０ｂ…ノズルアツセンブリ、１１
ａ，１１ｂ，１１ｃ…レール、１２…チエントラ
ンスフア、１３…架台、１４，１６…昇降枠、１
５，１７…昇降装置、１８，１９，２０…冷却ノ
ズル、２１…爪、２２…センターリング装置、２
３…クランプ装置、２４，２５，２６…風量調整
バルブ。
FIG. 1 is a front view of a heat treatment apparatus showing an embodiment of the present invention, FIG. 2 is a detailed view of the rail head, FIG. 3 is a side view of a cooling device according to an embodiment of the conventional apparatus, and FIG. Figure 3 is an enlarged cross-sectional view of a part of the cooling system, and Figure 5 shows the rail travel distance and cooling time when cooling is started after high-speed intake using a conventional pass-through cooling system. It is a relationship diagram. 1a, 1b... Spray header, 2a, 2b... Air zone, 3a, 3b... Bulkhead, 4... Rail web, 5
...Base tip edge, 6...Head, 7...Base, 9...Roller, 10a, 10b...Nozzle assembly, 11
a, 11b, 11c...Rail, 12...Chain transfer floor, 13...Frame, 14, 16...Elevating frame, 1
5, 17... Lifting device, 18, 19, 20... Cooling nozzle, 21... Claw, 22... Centering device, 2
3... Clamp device, 24, 25, 26... Air volume adjustment valve.
Claims (1)
ールの伸延方向と直角方向に移動する積載式搬送
装置と、該搬送装置の上部にこの搬送装置と独立
して設置された架台、及び該架台に取付けられた
昇降枠、該昇降枠に取付けられ、レール頭頂部冷
却用気体噴射ノズル、 前記昇降枠に昇降可能に取付けられたレール頭
側部冷却用気体噴射ノズルから構成されるレール
頭部冷却装置と、前記搬送装置の下部に固定配置
されたレール脚裏部冷却用気体噴射ノズル、及び
搬送装置下部に設置した昇降自在なレール用位置
決め・拘束装置を有することを特徴とする熱延レ
ールの熱処理装置。[Scope of Claims] 1. A heat treatment device for rails immediately after hot rolling, comprising: a loading type conveyance device that moves in a direction perpendicular to the extension direction of the rail; and a pedestal installed above the conveyance device independently of the conveyance device. , an elevating frame attached to the pedestal, a gas injection nozzle attached to the elevating frame for cooling the top of the rail head, and a gas injection nozzle for cooling the side of the rail head attached to the elevating frame so as to be movable up and down. It is characterized by having a rail head cooling device, a gas injection nozzle for cooling the back of the rail legs fixedly arranged at the lower part of the transporting device, and a rail positioning/restraint device installed at the lower part of the transporting device and movable up and down. Heat treatment equipment for hot rolled rails.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60151305A JPS6213528A (en) | 1985-07-11 | 1985-07-11 | Apparatus for heat treating hot rolled rail |
| EP85308972A EP0186373B1 (en) | 1984-12-24 | 1985-12-10 | Method of and apparatus for heat treating rails |
| AT85308972T ATE56477T1 (en) | 1984-12-24 | 1985-12-10 | METHOD AND APPARATUS FOR HEAT TREATMENT OF RAILS. |
| DE8585308972T DE3579681D1 (en) | 1984-12-24 | 1985-12-10 | METHOD AND DEVICE FOR TREATING THE RAILS. |
| AU51115/85A AU561642B2 (en) | 1984-12-24 | 1985-12-11 | Uniform hardness in steel rails by controlled gaseous cooling (method and apparatus) |
| CA000497471A CA1259552A (en) | 1984-12-24 | 1985-12-12 | Method of and apparatus for heat-treating rails |
| BR8506419A BR8506419A (en) | 1984-12-24 | 1985-12-20 | PROCESS AND APPARATUS FOR THERMAL TREATMENT OF A RAIL |
| CN85109735.9A CN1004881B (en) | 1984-12-24 | 1985-12-23 | Method and equipment for heat treatment of rail |
| KR1019850009738A KR900002195B1 (en) | 1984-12-24 | 1985-12-23 | Heat treatment method of the rail |
| US07/308,216 US4913747A (en) | 1984-12-24 | 1989-02-09 | Method of and apparatus for heat-treating rails |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60151305A JPS6213528A (en) | 1985-07-11 | 1985-07-11 | Apparatus for heat treating hot rolled rail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6213528A JPS6213528A (en) | 1987-01-22 |
| JPH0213012B2 true JPH0213012B2 (en) | 1990-04-03 |
Family
ID=15515762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60151305A Granted JPS6213528A (en) | 1984-12-24 | 1985-07-11 | Apparatus for heat treating hot rolled rail |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6213528A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11453929B2 (en) | 2017-03-15 | 2022-09-27 | Jfe Steel Corporation | Cooling device and production method for rail |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL1711638T3 (en) * | 2004-01-09 | 2010-01-29 | Nippon Steel Corp | Rail manufacturing method |
| JP4710952B2 (en) * | 2008-10-10 | 2011-06-29 | 株式会社ニコン | Polishing equipment |
| CN108193041B (en) * | 2018-03-23 | 2024-03-12 | 安吉长虹制链有限公司 | Round-link chain heat treatment device and method thereof |
-
1985
- 1985-07-11 JP JP60151305A patent/JPS6213528A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11453929B2 (en) | 2017-03-15 | 2022-09-27 | Jfe Steel Corporation | Cooling device and production method for rail |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6213528A (en) | 1987-01-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |